Mondi8

No they were not setup that way. It was locked with a password though. So I'm assuming that the re-seller changes that setting.

In a bit, however it's a copy of what's in the help manual, High side wiring.

Yes, I even had an in ignition signal to hopefully trigger it to power up. No blue light and no PC connection. On the bench with +12v only to plug 'A' and ground, blue light and PC link. The diagram I have shows the Main +- & ign switch on Plug 'C'. Plug 'D' is wired for power though.

OK, unless I've got this very wrong it seems that the ECU hold power option is akin to putting the cart before the horse. If the harness is wired up for ECU hold then the ECU will not turn on. You have to first power up the ECU, update and program independently of the harness if the harness has been setup for ECU hold. After pulling my hair out for a couple hrs going over pin-outs and wiring I took the ECU to the bench and ran it there with power/ground only on the 'A' plug and connected to the PC. Turned on and communicated just fine, a bit more digging and realized that the ECU hold option has to be turned on to work, there is no "sense" for this configuration (this is a thunder unit). But as noted if the harness is setup for ECU hold it will not turn on, so it has to bench tested and run first. That should be noted somewhere. Anyone else run into this?

OK, another unique setup. The gear box has an analog sensor that is used by the speedometer to derive the actual speed. I calculated the multiplication factor of the signal to arrive at the speed, great. Not so great is the Hz, it's 0~2.5 kHz for the actual signal. Well outside the range of the digital 1-6 spots. The signal is analog but I do have a converter for the digital output. I'm trying to avoid having to machine more parts and setup more sensors. Originality is key on this project so I'd like to piggy back off that signal and use it if at all possible.

5v bias pulse.

The IGF terminal on the Denso coils is a digital signal that is generated when the coil 'fires', it's supposedly used as a feedback to check that the coils are firing and not shorted or dead. Given that each coil only fires when signaled and I'm running full sequential then only a single wire is needed as the signal is timed to the firing order. So at a minimum it's simply a digital fq signal, if in the future it's possible to do something with it at least I've already gone to the trouble to wire it into the harness.

Thanks, should have RTFM... Updated the PC link software. Found the relevant sections. As to the feedback signal. I can still feed it into a digital input though right? graph it in real time or monitor it when needed? I don't know the difficulty of the programming needed but would it be possible to use that input in the future as a fault code trigger?

I have a couple questions about setting up and properly wiring the new A,B,C & D terminal ECU. The C loom has a "main relay" terminal, one negative one positive along with ignition switch. I'm a bit lost on this, I can't find any supporting documentation or sample wiring diagram to help explain how to utilize these optional terminals. I assume based on the abilities of the ECU I can wire it up to where the ECU controls the starter with a push button for example and hence the optional wiring. The other question has to do with more then one TPS, is it possible to have the ECU use more then one? reason is the engine I have for this particular build has 2 TPS sensors one for each bank. So run either a separate map for each bank or one but have the TPS trim the map based on it's value. Not sure if this is possible And lastly, 4 pin ignition coils run a feedback signal to monitor miss-fire or trip a fault code (in theory), all the coils share the same lead as the signal is simply a trigger signal confirmation so it's in sequence with the ignition signal, is there a way to feed that signal back and have it compare it to the actual ignition out signal and if there is a 'missing' pulse trigger a fault?